Journal
EPL
Volume 119, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/119/67001
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [25287089, 15H02108, 16H06346]
- Ministry od Education, Culture, Sports, Science and Technology (MEXT), Japan
- Grants-in-Aid for Scientific Research [17H05168, 16H06058, 25287089, 15H02108, 16H06346, 16H04140] Funding Source: KAKEN
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We report experimental measurements and theoretical analysis of Shubnikov-de Haas (SdH) oscillations in a Dirac cone system: the alpha-(BEDT-TTF)(2)I-3 organic metal under hydrostatic pressure. The measured SdH oscillations reveal anomalies at high magnetic fields B where the 1/B oscillations periodicity is lost above 7 T. We interpret these unusual results within a theoretical model that takes into account intrinsic distortions of the alpha-(BEDT-TTF)(2)I-3 Dirac cones such as a parabolic particle-hole asymmetric correction. Others possible causes, such as a cone tilting or a Zeeman effect, are carefully ruled out. The observations are consistent among alpha-(BEDT-TTF)(2)I-3 samples with different Fermi levels. Copyright (C) EPLA, 2017
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